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Solutions, Capstone Turbine and Orion Construction did an outstanding job of working with amazing speed, cooperation and flexibility to successfully complete the project.” To fuel the C30s, digester gas is compressed, dried and filtered before use. The three Capstone C30s generate up to 80 kW of electric power (net of compressor load), representing roughly 15% of the plant’s total demand. This reduces the amount of electricity that San Elijo must buy from the grid, lowering their power costs. At the same time, hot exhaust from the Capstone MicroTurbines is captured and used to heat water needed at the reclamation facility. The process is known as CHP—combined heat and power. One generator system uses one fuel source to yield two usable energy outputs with very high fuel efficiency. The Capstone MicroTurbine system emissions are substantially lower in methane and NOx than emissions from standard flaring and vastly less than those from reciprocating engine gensets. Not only does the Capstone solution provide San Elijo with cost-saving onsite power, it dramatically lowers the facility’s environmental impact. The Economics of Capstone Return on Investment, Government Grants and Monthly Savings In his cost benefit analysis of the Capstone MicroTurbine system, Thornton considered all the variables including system performance, grid electricity costs and eligibility for grants through the use of onsite power. “When you look at all the factors, including current electricity prices and grant funding, we’re anticipating payback in three to four years,” confirmed Thornton. “We’re seeing a drop in monthly electricity costs of $4,000 to $4,500.” A California Energy Commission grant contributed to the favorable ROI calculations. Thanks to onsite power from the Capstone MicroTurbine system, the facility received $300 per kW of peak load reduction for a total exceeding $25,000. In September 2002, the San Diego Regional Energy Office (www.sdenergy.org) awarded a $76,000 rebate check to the San Elijo Joint Powers Authority from San Diego Gas and Electric’s Self- Generation Incentive Program that promotes the use of clean, efficient distributed generation. The Capstone MicroTurbine: New Technology Meets Common Sense In choosing the Capstone MicroTurbine, Mike Thornton and the San Elijo management team reduced grid demand, resulting in significant cost savings and a cleaner environment. “We had a waste gas, a byproduct of the treatment process that we were not capitalizing on. Now we’re capturing it and using it productively,” Thornton said about the decision to go with a Capstone solution. “That makes good sense.” The microturbine generator for power on or beyond the grid: San Elijo Assistant Manager Mike Thornton shows off the Capstone solution that saves money and lowers emissions at his facility. Quick Facts: System Integrator: MWH Energy Solutions Number of Units: 3 Capstone Model C30s Electrical Output: Up to 80 kW (net of compressor load) Heat Recovery: Up to 205 kW or 700,000 Btu/hr Additional Equipment: Heat exchanger, compressors, dryers, filters Installation Purpose: • To reduce power costs and grid demand through peak shaving • To provide heat to maintain temperature needs of digesters • To utilize abundant onsite biogas as fuel • To reduce emissions formed during biogas combustion • Ultra-Low Emissions • Designed for Ultra-Low Maintenance • Fuel-Flexible • Air-Cooled • One Moving Part • No Lubricants or Coolants Let Capstone create your success story. Visit www.microturbine.com or call 818-407-3770 or, toll free, 866-4-capstone (866-422-7786) to find your authorized Capstone distributor. Power when and where you need it. Clean and simple. Now. Capstone and the turbine blade logo are Registered Trademarks of Capstone Turbine Corporation. Certain data are site-specific and subject to change. Unique factors at individual sites may affect system output and performance.PDF Image | A Wastewater Treatment Plant Turns Onsite Biogas into Clean, Money-Saving Electricity and Heat
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